Power-hammer.



A. MALAURIE.

POWER HAMMER.

' APPLICATION FILED MAR. 23. 1910 Patented Dec. 27, 1910.

e n V A H I. 2

I ED STATES Parana OFFICE.

'ABEL MALAURIE, or rAn Is rnAivcn.

' rowznn namnna.

To an whom itmy concern.

. Be it known that I, ABEL MALAURIE, a citizen of France, residing at 78 Rue de Dunkerque, Paris, inthe Republic of France,- have invented new and useful Improvements in Power-Hammers'pf which the following is a specification.

' leaving'sairl piston permits thelatter-to'hfl My invention relates toa power hammer adapted to be used by hand which presents over other power hammers alreadyknown and particularly fluid operated hammers the. advantage of being very easily movable from one point to another more or less distant from the power plant without necessitating the installation oficoin' re ssors or additiona piping as in the case o' pneuni'atic hammers.

My invention consists in the use foractu; ating the hammer, of aflexible transmission connected toa cam which isf di s'posedfsogasf to lift a percussionpiston ,orbody against the actionof resilient means su ehgson. ex-" ample, as compressed air, the cam after suddenly against the tool under theiexpan- .sion of the resilient means, In'its preferred;

form, my' ower hammer is c onstructed'so that the piston maybe gradually removed: from the action of the canrfor the purpose of'regulatin the force of the blows and finally stopplng the hammer at will.

In ,the amiexed drawing; Figure 1 is a longitudinal. section through apower hammer according to my invention. Fi 2 is across section thereof along the line i K Fig. I. Fig. 3 is a part elevation ofthe same.

. Referring to the drawing, 1 represents the casing or body of the hammer which; is provided with a recess 2' for receiving the cam-- 3 and has two side plates 4 secured thereon, said side plates havinglatcral hubs in which the shaft 5 of the cam rotates. The-shaft 5... is directly actuated from the power plant through the flexible connection 6 which may be of any desirable length. In the lower partof the casing 1, is inserted the tool 7. A tube or sleeve 8 which is adapted to .slide in the casing has a longitudinal rdccss'tl for the passage of the cam and the-handlellO is secured to the upper end thereof, said handle serving to hold and guide the hanuncr. ln'the sleeve 8 is placed the piston 11 which 1 is provided with a recess 12 for the working Specification of Letters Patent. P t t D 2-7, 0 Application filed March 23,

1910. J Serial No. 551,150.

- an air cylinder whereby it can slide over a stationary piston 14 secured in the sleeve 8 and leavin an annular chamber 16 between it and the inner wall of the sleeve.

15 represents an opening through the walls: of the casing 1 and sleeve 8.

When the piston 11 is lifted by the cam rotating in the direction of the arrow, the air is compressed in the bore' 13 and in the annular chamber 16 which formsa second cylinder, so that the-entire surface exposed thereafter to the e ansion of the com- ,pressed air} oorrespon s to' the cross section fa. pistonjha'vin a diameter of the length ;indicated atpiston,-zthe-j-latter is thrown back by the compressed air and a strong blow is given thereby upon the head of the tool 7. Upon the piston 11 reaching the end of its downwar stroke, the opening 15 is 'exposed so that the outer. air may enter the annular chamber 16' for compensating any leakage in the oompressio'n. The arrangement of .parts is such that the pressure in bore 13 is always lower than in the annular chamber 16 so that no leakage can occur from the bore, the admittance of outer air to the same being therefore unnecessary.

The hammer may be thrown out oi action andtlle' force of the blows may'be regulated by the follo in means. The recess 12 in the piston l is fa length equal or superior to twice the grdate'st radius of the cam so that if 9. nl is exerted on the handle 10 for moving tlie sleeve 8 and the piston 11 contained therein in the casing l andbringing the'upper edge of the recess 12 in said piston in front'of the upper edge of the recess 2 in the casing 1, the cam will be free to rotatew i thout actuating the hammer. F or --throwiiig the hammerinto action it will be sufficient to depress the handle and to force the sleeve S together with the piston 11 into the casing so as to bring'the latter gradually the sleeve 8 is entirely forced into the casing I 1 as shown in the drawing. A stop 17 prerents the sleeve 8 from being drawn out of the casing 1 beyond the desired limit. A pin 18 extending from the sleeve S engagcs :1

operating with the cam. The piston '11 has longitudinal slot- 19 in the casing 1, said slot having one end extending at right angle as shown in Fig. 3. This arrangement is such that the sleeve 8 and handle 10 may be secured in their lowest position by simply turning the handle with regard to the easing for-engaging the pin into the end of the slot, which is of advantage when heavy blows are to be delivered for a long period.

My power hammer is adapted to work in any position and the flexible connection )ermits the same to be used very easily an in any desired place. The flexible transmission-may be connectedl for instance to a small electric motor located in the vic'inity of the place where the power hammer is used.

The hammer may be used with advantage for riveting, ing, etc.

Having now described my invention, what I claim as new and desire to secure by Letters Patent is:

cutting, chiseling, perforatl., In a device of the character described,

the combination with a casing, of a piston reciprocable. therein and being adapted to compress a resilient medium when the piston is retracted in the casing, means' for retracting the piston, in the casing, and means to vary the position of the piston in relation to the retracting means, whereby the force of the piston stroke, due to the expansion of said resilientmedium, may -be.

varied.

2. In a" device of the character described,-

. the combination with a casing, of a piston reciprocable therein, 'a stationary piston be? tween which andtbe reci'proable piston a resilient medium is adapted to be compressed when the reciprocable piston is retracted in the casing, means for retracting the reciprocable piston in the casing, and means to vary-the position of said last named piston;

in relation to the retractin means, whereby the force of the piston stro e, due to the expension of said resilient medium, may be 3.; In a: device of the character'described, the combmation with a c sing, of a sleeve therein, a piston reciproc le in said sleeve,

a stationary piston carried by said sleeve,

,means for retracting the reciprocable piston in the sleeve, and means for moving the sleeve, means for actuating said cam, and.

.means for moving said sleeve in the casing to vary the position of the piston relatively.

to the cam.

5, In a device of the character, described, the combination with a casing, of a sleeve longitudinally adjustable therein, a stationary piston integral with the sleeve, a reciprocable piston in. the sleeve, there being a bore between one face of the stationary pis-,

ton and one face of the reciprocable piston wherein a resilient medium may be compressed when the reciprocable'piston 'is retracted in the sleeve, means for retracting the reciprocable piston, and means for adjusting the sleeve-in the casing to vary the position of the' reciprocable piston in rel a tion to the retracting means.

'6; Ina device of the character described,

the combination with a casing having an air adinissionopening therein, of a sleeve hav-.

an air admission openin .and being movable 1n the casing relatively to the latter,- a cam mounted in said casing, means for operating said cam, a stationary piston in the sleeve and integral therewith, there be-' ing an annular chamber between said piston and "sleeve, and a piston reciprocable in. said sleeve and having a recess for receiving the cam and having also a bore for receiving the end lot the stationary piston, said bore and said annular chamber being adapted to receive air through the air admission openings in the sleeve and casing;

In testimony whereof'I' have signed my name to this specificatioii' in the presence of two subscribing witnesses. I

Manam- Witnessesz' LoUIsMosss,

H. C, Coins. 

